No
No
Yes
Is there
temperature
difference between front end
and rear end of subcooling
LEV in cooling
operation?
Is there
significant temperature
difference between front end
and rear end of subcooling
LEV in heating
operation?
Start of check.
Reconnect the terminal.
Excessive Cold LEV.
No failure of subcooling LEV.
Yes
Is connection of the
PCB terminal normal?
Replace the PCB.
Is signal applied normally
from the PCB?
Check LEV coils and replace
the subcooling LEV.
Yes
No
No
Yes
Reconnect the terminal.
Yes
Is connection of the
PCB terminal normal?
Replace the PCB.
Is signal applied normally
from the PCB?
Check LEV coils and replace
the subcooling LEV.
No
Yes
No
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